US11057841B2 - Method and apparatus for controlling ue transmission power in wireless communication system - Google Patents

Method and apparatus for controlling ue transmission power in wireless communication system Download PDF

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US11057841B2
US11057841B2 US16/790,157 US202016790157A US11057841B2 US 11057841 B2 US11057841 B2 US 11057841B2 US 202016790157 A US202016790157 A US 202016790157A US 11057841 B2 US11057841 B2 US 11057841B2
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sidelink
pssch
transmission power
pscch
path loss
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US20200260386A1 (en
Inventor
Hyunseok RYU
Jeongho Yeo
Jinyoung Oh
Sungjin Park
Jonghyun Bang
Cheolkyu Shin
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/38—TPC being performed in particular situations
    • H04W52/383—TPC being performed in particular situations power control in peer-to-peer links
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/242—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account path loss
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/247—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters where the output power of a terminal is based on a path parameter sent by another terminal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/32—TPC of broadcast or control channels
    • H04W52/325—Power control of control or pilot channels
    • H04W72/0406—
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/20—Control channels or signalling for resource management
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W76/00—Connection management
    • H04W76/10—Connection setup
    • H04W76/14—Direct-mode setup
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/18—TPC being performed according to specific parameters
    • H04W52/24—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters
    • H04W52/245—TPC being performed according to specific parameters using SIR [Signal to Interference Ratio] or other wireless path parameters taking into account received signal strength

Definitions

  • the disclosure relates to a method for controlling user equipment (UE) transmission power in a wireless communication system. More particularly, the disclosure relates to a method and an apparatus for setting transmission power when a UE (terminal) transmits a sidelink control channel and a sidelink data channel.
  • UE user equipment
  • the 5G or pre-5G communication system is also called a ‘Beyond 4G Network’ or a ‘Post long term evolution (LTE) System’.
  • the 5G communication system is considered to be implemented in higher frequency (millimeter (mm) Wave) bands, e.g., 60 gigahertz (GHz) bands, so as to accomplish higher data rates.
  • millimeter (mm) Wave) bands e.g., 60 gigahertz (GHz) bands
  • the beamforming, massive multiple-input multiple-output (MIMO), Full Dimensional MIMO (FD-MIMO), array antenna, an analog beam forming, large scale antenna techniques are discussed in 5G communication systems.
  • MIMO massive multiple-input multiple-output
  • FD-MIMO Full Dimensional MIMO
  • array antenna an analog beam forming, large scale antenna techniques.
  • system network improvement is under way based on advanced small cells, cloud Radio Access Networks (RANs), ultra-dense networks, device-to-device (D2D) communication, wireless backhaul, moving network, cooperative communication, Coordinated Multi-Points (CoMP), reception-end interference cancellation and the like.
  • RANs cloud Radio Access Networks
  • D2D device-to-device
  • CoMP Coordinated Multi-Points
  • FSK Hybrid Frequency-shift keying
  • QAM Quadrature Amplitude Modulation
  • SWSC sliding window superposition coding
  • ACM advanced coding modulation
  • FBMC filter bank multi carrier
  • NOMA non-orthogonal multiple access
  • SCMA sparse code multiple access
  • the Internet which is a human centered connectivity network where humans generate and consume information
  • IoT Internet of Things
  • IoE Internet of Everything
  • sensing technology “wired/wireless communication and network infrastructure”, “service interface technology”, and “Security technology”
  • M2M Machine-to-Machine
  • MTC Machine Type Communication
  • IoT Internet technology services
  • IoT may be applied to a variety of fields including smart home, smart building, smart city, smart car or connected cars, smart grid, health care, smart appliances and advanced medical services through convergence and combination between existing Information Technology (IT) and various industrial applications.
  • IT Information Technology
  • 5G communication systems to IoT networks.
  • technologies such as a sensor network, Machine Type Communication (MTC), and Machine-to-Machine (M2M) communication may be implemented by beamforming, MIMO, and array antennas.
  • MTC Machine Type Communication
  • M2M Machine-to-Machine
  • Application of a cloud Radio Access Network (RAN) as the above-described Big Data processing technology may also be considered to be as an example of convergence between the 5G technology and the IoT technology.
  • RAN Radio Access Network
  • an aspect of the disclosure is to provide a method for controlling transmission powers of a sidelink control channel and a sidelink data channel.
  • a method performed by a first user equipment (UE) in a wireless communication system includes receiving, from a base station, a radio resource control (RRC) message including information related to sidelink transmission power, determining sidelink transmission power, based on the information, and transmitting a sidelink control channel and a sidelink data channel, based on the determined sidelink transmission power, wherein the information includes at least one of downlink path loss-related information or sidelink path loss-related information.
  • RRC radio resource control
  • a method performed by a base station in a wireless communication system includes transmitting, to a first UE, an RRC message including information related to sidelink transmission power, and receiving, from the first UE, a sidelink control channel and a sidelink data channel, based on sidelink transmission power, wherein the sidelink transmission power is determined based on the information, and wherein the information includes at least one of downlink path loss-related information or sidelink path loss-related information.
  • a first UE in another aspect of the disclosure, includes a transceiver configured to transmit or receive at least one signal, and at least one processor coupled to the transceiver.
  • the at least one processor is configured to receive, from a base station, an RRC message including information related to sidelink transmission power, determine sidelink transmission power, based on the information, and transmit a sidelink control channel and a sidelink data channel, based on the determined sidelink transmission power, and wherein the information includes at least one of downlink path loss-related information or sidelink path loss-related information.
  • a base station in another aspect of the disclosure, includes a transceiver configured to transmit or receive at least one signal, and at least one processor coupled to the transceiver.
  • the at least one processor is configured to transmit, to a first UE, an RRC message including information related to sidelink transmission power, and receive, from the first UE, a sidelink control channel and a sidelink data channel, based on sidelink transmission power, wherein the sidelink transmission power is determined based on the information, and wherein the information includes at least one of downlink path loss-related information or sidelink path loss-related information.
  • transmission powers of a sidelink control channel and a sidelink data channel can be effectively controlled.
  • FIG. 1A illustrates a system according to an embodiment of the disclosure
  • FIG. 1B illustrates a system according to an embodiment of the disclosure
  • FIG. 1C illustrates a system according to an embodiment of the disclosure
  • FIG. 1D illustrates a system according to an embodiment of the disclosure
  • FIG. 2A illustrates a vehicle to everything (V2X) communication method performed via sidelink according to an embodiment of the disclosure
  • FIG. 2B illustrates a V2X communication method performed via sidelink according to an embodiment of the disclosure
  • FIG. 3 illustrates V2X transmission power control according to an embodiment of the disclosure
  • FIG. 4 illustrates interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the disclosure
  • FIG. 5 illustrates interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the disclosure
  • FIG. 6 illustrates V2X transmission power control according to an embodiment of the disclosure
  • FIG. 7 is a diagram illustrating a sidelink resource for performing V2X communication according to an embodiment of the disclosure.
  • FIG. 8 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 9 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 10 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 11 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 12 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 13 illustrates a multiplexing method of a sidelink channel within a sidelink resource according to an embodiment of the disclosure
  • FIG. 14 illustrates an operational flowchart of a V2X UE for sidelink transmission power control according to an embodiment of the disclosure
  • FIG. 15 is a diagram illustrating a UE configuration according to an embodiment of the disclosure.
  • FIG. 16 is a diagram illustrating a base station's configuration according to an embodiment of the disclosure.
  • each block of the flowchart illustrations, and combinations of blocks in the flowchart illustrations can be implemented by computer program instructions.
  • These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart block or blocks.
  • These computer program instructions may also be stored in a computer usable or computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer usable or computer-readable memory produce an article of manufacture including instruction means that implement the function specified in the flowchart block or blocks.
  • the computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operations to be performed on the computer or other programmable data processing apparatus to produce a computer implemented process such that the instructions that execute on the computer or other programmable data processing apparatus provide operations for implementing the functions specified in the flowchart block or blocks.
  • each block of the flowchart illustrations may represent a module, segment, or portion of code, which includes one or more executable instructions for implementing the specified logical function(s).
  • the functions noted in the blocks may occur out of the order. For example, two blocks shown in succession may in fact be executed substantially concurrently or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved.
  • the “unit” refers to a software element or a hardware element, such as a field programmable gate array (FPGA) or an application specific integrated circuit (ASIC), which performs a predetermined function.
  • FPGA field programmable gate array
  • ASIC application specific integrated circuit
  • the “unit” does not always have a meaning limited to software or hardware.
  • the “unit” may be constructed either to be stored in an addressable storage medium or to execute one or more processors. Therefore, the “unit” includes, for example, software elements, object-oriented software elements, class elements or task elements, processes, functions, properties, procedures, sub-routines, segments of a program code, drivers, firmware, micro-codes, circuits, data, database, data structures, tables, arrays, and parameters.
  • the elements and functions provided by the “unit” may be either combined into a smaller number of elements, “unit” or divided into a larger number of elements, “unit”. Moreover, the elements and “units” may be implemented to reproduce one or more central processing units (CPUs) within a device or a security multimedia card. Also, in an embodiment, the “ ⁇ unit” may include one or more processors.
  • main objects are a radio access network (new RAN, NR) and a core network, namely packet core (5G system, 5G core network, or next generation core (NG Core)) in the 5G mobile communication standard specified by a mobile communication standard standardization organization (3GPP).
  • a radio access network new RAN, NR
  • a core network namely packet core (5G system, 5G core network, or next generation core (NG Core)) in the 5G mobile communication standard specified by a mobile communication standard standardization organization (3GPP).
  • 3GPP mobile communication standard standardization organization
  • a network data collection and analysis function which is a network function of analyzing data collected in a 5G network and providing the analyzed data.
  • the NWDAF can collect/store/analyze information from/in/of the 5G network and provide a result for an unspecified network function (NF), and the analysis result can be independently used in each NF.
  • NF network function
  • 3GPP LTE 3rd generation partnership project long term evolution
  • 5G Fifth Generation
  • NR Long Term Evolution
  • LTE Long Term Evolution
  • the disclosure is not limited by the terms and names, and may be equally applied to a system that is based on another standard.
  • the 5G communication system In order to meet wireless data traffic demands that have increased after 4G communication system commercialization, efforts to develop an improved 5G communication system (new radio, NR) have been made.
  • the 5G communication system In order to achieve a high data transmission rate, the 5G communication system is designed to support in a mmWave band (for example, 28 GHz frequency band).
  • technologies such as beamforming, massive MIMO, full dimensional MIMO (FD-MIMO), array antenna, analog beam-forming, and large scale antenna are being discussed as a means to mitigate a propagation path loss in the mmWave band and increase a propagation transmission distance.
  • the 5G communication system includes 15 kHz to support various subcarrier spacings such as 30 kHz, 60 kHz, and 120 kHz, and a physical control channel uses polar coding and a physical data channel uses low density parity check (LDPC).
  • LDPC low density parity check
  • DFT-S-OFDM discrete fourier transform spread orthogonal frequency-division multiplexing
  • CP-OFDM cyclic prefix
  • LTE supports hybrid automatic repeat request (ARQ) (HARQ) retransmission based on a transport block (TB), whereas 5G can additionally support HARQ retransmission based on a code block group (CBG) consisting of code blocks (CB).
  • ARQ hybrid automatic repeat request
  • CBG code block group
  • the 5G communication system has developed technologies such as an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, device-to-device (D2D) communication, a wireless backhaul, a vehicle to everything (V2X) network, cooperative communication, coordinated multi-points (COMP), and received interference cancellation so as to improve the system network.
  • technologies such as an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, device-to-device (D2D) communication, a wireless backhaul, a vehicle to everything (V2X) network, cooperative communication, coordinated multi-points (COMP), and received interference cancellation so as to improve the system network.
  • technologies such as an evolved small cell, an advanced small cell, a cloud radio access network (cloud RAN), an ultra-dense network, device-to-device (D2D) communication, a wireless backhaul, a vehicle to everything (V2X) network, cooperative communication, coordinated multi-
  • IoT internet of things
  • IoE internet of everything
  • an intelligent internet technology (IT) service to create a new value for peoples' lives can be provided.
  • the IoT can be applied to fields such as those of a smart home, a smart building, a smart city, a smart car, a connected car, a smart grid, health care, a smart home appliance, and high-tech medical services through the convergence of the information technology (IT) of the related art and various industries.
  • a technology such as a sensor network, machine-to-machine (M2M) communication, and machine-type communication (MTC), has been implemented by the 5G communication technology such as beamforming, MIMO, and array antennas.
  • the application of a cloud RAN as the big data processing technology described above may be an example of convergence of a 3eG technology and the IoT technology. Therefore, a plurality of services can be provided for a user in a communication system, and in order to provide the plurality of services for the user, a method for providing each service according to characteristics within the same time section and an apparatus using this method are required.
  • Research on various services, which are provided in the 5G communication system has been conducted, and one of the services is a service satisfying requirements such as low latency and high reliability.
  • NR V2X will support unicast communication, groupcast (or multicast) communication, and broadcast communication between UEs.
  • NR V2X has a purpose of providing further advanced services such as platooning, advanced driving, extended sensor, and remote driving.
  • the NR V2X UE may receive, from the base station, parameter values for controlling sidelink transmission power, and control sidelink transmission power, based on the parameter values.
  • the NR V2X UE may use preset sidelink transmission power control parameter values to control sidelink transmission power.
  • the sidelink transmission power control parameters may include P 0 and ⁇ .
  • the NR V2X UE may set a transmission power value according to frequency block size of a sidelink control channel and a data channel to be transmitted thereby, as well as the values of P 0 and ⁇ mentioned above.
  • a sidelink control channel and a data channel may be time-division-multiplexed (TDMed) on the time axis or frequency-division-multiplexed (FDMed) on the frequency axis, before being transmitted. Therefore, a method and an apparatus for controlling UE transmission power to support sidelink transmission power in these various multiplexing methods are required.
  • TDMed time-division-multiplexed
  • FDMed frequency-division-multiplexed
  • An embodiment of the specification is proposed to support the various multiplexing methods described above, and a purpose is to provide a method and an apparatus for controlling transmission powers of a sidelink control channel and a data channel.
  • a V2X UE mentioned in the disclosure may indicate an NR V2X UE or an LTE V2X UE.
  • the V2X UE of the disclosure may indicate a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle or a pedestrian's handset (that is, smartphone) supporting vehicle-to-pedestrian (V2P) communication, a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication.
  • a UE of the disclosure may indicate a road side unit (RSU) having a UE function, an RSU having a base station function, or an RSU having a part of a base station function and a part of a UE function.
  • RSU road side unit
  • FIG. 1A illustrates a system according to an embodiment of the disclosure
  • FIG. 1B illustrates a system according to an embodiment of the disclosure
  • FIG. 1C illustrates a system according to an embodiment of the disclosure
  • FIG. 1D illustrates a system according to an embodiment of the disclosure.
  • FIG. 1A illustrates a case in which all V2X UEs (UE- 1 101 and UE- 2 102 ) are positioned within the coverage of a base station 103 .
  • all the V2X UEs 101 and 102 may receive, from the base station 103 , data and control information via downlink (DL), or transmit, to the base station 103 , data and control information via uplink (UL).
  • the data and control information may be data and control information for V2X communication, or the data and control information may be data and control information for general cellular communication.
  • the V2X UEs 101 and 102 may transmit or receive data and control information for V2X communication via sidelink (SL).
  • FIG. 1B illustrates a case in which among V2X UEs, a UE- 1 111 is positioned within the coverage of a base station 113 and a UE- 2 112 is positioned out of the coverage of the base station 113 .
  • FIG. 1B may illustrate partial coverage.
  • the UE- 1 111 positioned within the coverage of the base station 113 may receive, from the base station 113 , data and control information via downlink, or transmit, to the base station, data and control information via uplink.
  • the UE- 2 112 positioned out of the coverage of the base station may not receive, from the base station, data and control information via downlink, and may not transmit, to the base station, data and control information via uplink.
  • the UE- 2 112 may transmit/receive data and control information for V2X communication to/from the UE- 1 111 via sidelink.
  • FIG. 1C illustrates a case in which all V2X UEs are positioned out of the coverage of a base station.
  • a UE- 1 121 and a UE- 2 122 may not receive, from a base station, data and control information via downlink, and may not transmit, to the base station, data and control information via uplink.
  • the UE- 1 121 and the UE- 2 122 may transmit or receive data and control information for V2X communication via sidelink.
  • FIG. 1D illustrates a scenario of performing V2X communication between UEs positioned in different cells. Specifically, FIG. 1D illustrates a case in which a V2X transmission UE and a V2X reception UE access different base stations (radio resource control (RRC) connection state) or camp on different base stations (RRC disconnection state, that is, RRC idle state).
  • RRC radio resource control
  • a UE- 1 131 may be a V2X transmission UE and a UE- 2 132 may be a V2X reception UE, or the UE- 1 131 may be a V2X reception UE and the UE- 2 132 may be a V2X transmission UE.
  • the UE- 1 131 may receive, from a base station 133 which the UE- 1 accesses (or on which the UE- 1 camps), a V2X exclusive system information block (SIB), and the UE- 2 132 may receive, from another base station 134 which the UE- 2 accesses (or on which the UE- 2 camps), a V2X exclusive SIB.
  • SIB V2X exclusive system information block
  • Information of the V2X exclusive SIB which the UE- 1 131 receives and information of the V2X exclusive SIB which the UE- 2 132 receives may differ from each other. Therefore, in order to perform V2X communication between UEs positioned in different cells, pieces of information are required to be unified.
  • FIGS. 1A to 1D illustrate a V2X system constituted by two UEs (UE- 1 and UE- 2 ) for convenience of description, but the disclosure is not limited thereto.
  • uplink and downlink between a base station and V2X UEs may be called an Uu interface
  • sidelink between V2X UEs may be called a PC5 interface. Therefore, they can be mixedly used in the disclosure.
  • the UE of the disclosure may indicate a vehicle supporting vehicle-to-vehicle (V2V) communication, a vehicle or a pedestrian's handset (that is, smartphone) supporting vehicle-to-pedestrian (V2P) communication, a vehicle supporting vehicle-to-network (V2N) communication, or a vehicle supporting vehicle-to-infrastructure (V2I) communication.
  • V2V vehicle supporting vehicle-to-vehicle
  • V2P vehicle or a pedestrian's handset
  • V2N vehicle supporting vehicle-to-network
  • V2I vehicle supporting vehicle-to-infrastructure
  • the UE of the disclosure may indicate a road side unit (RSU) having a UE function, an RSU having a base station function, or an RSU having a part of a base station function and a part of a UE function.
  • RSU road side unit
  • the base station of the disclosure may be previously defined as a base station supporting both V2X communication and general cellular communication or a base station supporting only V2X communication.
  • the base station may indicate a 5G base station (gNB), a 4G base station (eNB), or a road site unit (RSU). Therefore, unless otherwise specified in the disclosure, a base station and an RSU can be mixedly used as the same concept.
  • gNB 5G base station
  • eNB 4G base station
  • RSU road site unit
  • FIG. 2A illustrates a V2X communication method performed via sidelink according to an embodiment of the disclosure
  • FIG. 2B illustrates a V2X communication method performed via sidelink according to an embodiment of the disclosure.
  • a TX UE (a UE- 1 201 ) and an RX UE (a UE- 2 202 ) may perform one-to-one communication, and this communication may be called unicast communication.
  • a TX UE and an RX UE may perform one-to-many communication, and this communication may be called groupcast or multicast communication.
  • FIG. 2B is a diagram illustrating that a UE- 1 211 , a UE- 2 212 , and a UE- 3 213 form group A to perform groupcast communication, and a UE- 4 214 , a UE- 5 215 , a UE- 6 216 , and a UE- 7 217 form group B to perform groupcast communication.
  • Each of the UEs performs groupcast communication within a group to which each of the UEs belongs, and communication between different groups is not performed.
  • FIG. 2B illustrates that two groups are formed, but the disclosure is not limited thereto.
  • V2X UEs may perform broadcast communication.
  • the broadcast communication indicates a case in which all V2X UEs receive data and control information that a V2X transmission UE transmits via sidelink.
  • the UE- 1 is a transmission UE for broadcast communication
  • all the UEs (UE- 2 212 , UE- 3 213 , UE- 4 214 , UE- 5 215 , UE- 6 216 , and UE- 7 217 ) may receive data and control information that the UE- 1 211 transmits.
  • FIG. 3 illustrates V2X transmission power control according to an embodiment of the disclosure.
  • a UE 1 301 is positioned close to a base station (gNB) 303 , and a UE 2 302 is positioned far from the gNB 303 (that is, the UE 1 is positioned at the cell center and the UE 2 is positioned at the cell edge).
  • gNB base station
  • UE 2 302 is positioned far from the gNB 303
  • the UE 1 301 and the UE 2 302 perform V2X communication therebetween
  • the UE 1 301 is a V2X transmission UE and the UE 2 302 is a V2X reception UE.
  • the UE 1 301 may perform sidelink transmission power control for V2X transmission.
  • Parameters for sidelink transmission power of the UE 1 301 may include at least P 0 , ⁇ , an estimated path loss value, and the size of an allocated frequency block, and may be equal to what shown in Equation 1.
  • Sidelink transmission power min ⁇ Pc max, P 0 + ⁇ PL+ 10 log 10(Number of RBs* 2 ⁇ )+ ⁇ [dBm] Equation 1
  • each parameter may indicate the following.
  • Equation 2 may be differently applied depending on a scenario as follows.
  • FIG. 4 illustrates interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the disclosure.
  • FIG. 5 illustrates interference caused by a frequency block transmitted by a V2X UE in an adjacent frequency block according to an embodiment of the disclosure.
  • FIGS. 4 and 5 illustrate a degree of interference caused by a sidelink signal in a gNB reception signal.
  • sidelink control information or data information is transmitted in resource block index 12 (one resource block is used), and referring to FIG. 5 , it is assumed that sidelink control information or data information is transmitted by using five resource blocks from resource block index 12 to 17.
  • FIG. 4 since sidelink transmission is performed only in resource block index 12, transmission power should be generated only in the corresponding resource index, but it is found that due to interference (in-band emission), transmission power is generated even in neighboring resource indices (for example, index 9, 10, 11, 13, 14, and 15). It is found that as illustrated in FIG. 5 , such interference volume becomes bigger as the number of resource blocks allocated for sidelink transmission increases. Therefore, a V2X UE positioned close to the gNB is required to use low transmission power not to cause interference to a reception signal of the gNB.
  • FIG. 6 illustrates V2X transmission power control according to an embodiment of the disclosure.
  • V2X UEs 601 and 602 are positioned close to each other, but positioned far from a gNB 603 , when a downlink path loss value is used, unnecessary power consumption and interference in adjacent V2X UEs may be caused. Therefore, both methods above may be required.
  • FIG. 7 is a diagram illustrating a sidelink resource for, by a V2X UE, performing V2X communication according to an embodiment of the disclosure.
  • a sidelink resource may be constituted by K symbols on the time axis and be constituted by M resource blocks (RB) on the frequency axis.
  • One resource block may be constituted by twelve sub-carriers.
  • the K symbols may be physically continuous or logically continuous on the time axis (in a case of being logically continuous, the symbols may be physically discontinuous).
  • the M resource blocks may be physically continuous or logically continuous on the frequency axis (in a case of being logically continuous, the blocks may be physically discontinuous).
  • a V2X transmission UE may use the sidelink resource of FIG. 7 to transmit sidelink control information or data information.
  • a V2X reception UE may use the sidelink resource of FIG. 7 to receive sidelink control information or data information.
  • a V2X reception UE may use the sidelink resource of FIG. 7 to transmit sidelink feedback information to a V2X transmission UE.
  • values of K and M may be identical or vary depending on the time when sidelink control information or data information is transmitted. For example, when a V2X transmission UE transmits sidelink control information (or sidelink data information) at the time of T1, the values of K and M may be equal to or different from the values of K and M when a V2X transmission UE transmits sidelink control information (or sidelink data information) at the time of T2.
  • FIG. 7 values of K and M may be identical or vary depending on the time when sidelink control information or data information is transmitted. For example, when a V2X transmission UE transmits sidelink control information (or sidelink data information) at the time of T1, the values of K and M may be equal to or different from the values of K and M when a V2
  • the values of K and M may be identical or vary depending on the time when a V2X reception UE receives sidelink control information or data information. For example, when a V2X reception UE receives sidelink control information (or sidelink data information) at the time of T1, the values of K and M may be equal to or different from the values of K and M when a V2X reception UE receives sidelink control information (or sidelink data information) at the time of T2. In addition, referring to FIG. 7 , the values of K and M may be identical or vary depending on the time when a V2X reception UE transmits sidelink feedback information to a V2X transmission UE.
  • the values of K and M may be equal to or different from the values of K and M when a V2X reception UE transmits sidelink feedback information to a V2X transmission UE at the time of T2.
  • FIG. 8 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure.
  • a PSCCH and a PSSCH may be constituted by the same number of resource blocks (M RBs) on the frequency axis, and may be constituted by K1 symbols and K2 symbols, respectively, on the time axis.
  • M RBs resource blocks
  • K1 symbols and K2 symbols respectively, on the time axis.
  • Values of K1 and K2 may be equal to or different from each other.
  • the values may be K1>K2 or K1 ⁇ K2.
  • the V2X transmission UE may transmit sidelink control information (SCI) including time/frequency allocation information of the PSSCH, through the PSCCH.
  • the V2X reception UE may receive and decode the PSCCH, and then may acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 8 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • a physical sidelink feedback channel PSFCH
  • the PSCCH may be constituted by the K1 symbols
  • the PSSCH may be constituted by the K2 symbols and a guard symbol
  • the PSFCH may be constituted by K3 symbols, and K1+K2+ the number of guard symbols+K3 may be smaller than K.
  • the guard symbol may be one or at least two OFDM symbols.
  • the V2X reception UE may decode the PSSCH, and then may transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X UE using a sidelink resource structure of FIG. 8 may determine each of transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH through Equation 3.
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSCCH + ⁇ P SCCH *PL ( q )+10 log 10( M* 2 ⁇ )+ ⁇ PSSCH ( i ) ⁇ [dBm]
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSSCH + ⁇ P SSCH *PL ( q )+10 log 10( M* 2 ⁇ + ⁇ PSSCH ( i ) ⁇ [dBm] Equation 3
  • each parameter may indicate the following.
  • FIG. 9 illustrates a multiplexing method of a sidelink control channel and a sidelink data channel within a sidelink resource according to an embodiment of the disclosure.
  • FIG. 9 illustrates that a PSCCH and a PSSCH are time-division-multiplexed, but unlike FIG. 8 , illustrates that the PSCCH and the PSSCH are constituted by different numbers of resource blocks on the frequency axis. That is, on the frequency axis, the PSCCH may be constituted by N1 frequency blocks, and the PSSCH may be constituted by M frequency blocks. N1 may be smaller than M (N1 ⁇ M). Meanwhile, similar to FIG. 8 , on the time axis, the PSCCH may be constituted by K1 symbols, and the PSSCH may be constituted by K2 symbols. The values of K1 and K2 are equal to or different from each other.
  • the V2X transmission UE may transmit sidelink control information (SCI) including time/frequency allocation information of the PSSCH through the PSCCH.
  • SCI sidelink control information
  • the V2X reception UE may receive and decode the PSCCH, and then may acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 9 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • FIG. 9 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • FIG. 9 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PS
  • a PSFCH may exist within a sidelink resource constituted by K symbols.
  • the PSCCH may be constituted by the K1 symbols
  • the PSSCH may be constituted by the K2 symbols and a guard symbol
  • the PSFCH may be constituted by K3 symbols, and K1+K2+ the number of guard symbols+K3 may be equal to or smaller than K.
  • the guard symbol may be one or at least two OFDM symbols.
  • the size of resource blocks may be equal to or different from the size of resource blocks of the PSCCH and the PSSCH.
  • the V2X reception UE may decode the PSSCH, and then transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X UE using a sidelink resource structure of FIG. 9 may determine each of transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH through Equation 4.
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSCCH + ⁇ PSCCH *PL ( q )+10 log 10( N 1*2 ⁇ )+ ⁇ PSSCH ( i ) ⁇ [dBm]
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSSCH + ⁇ PSSCH *PL ( q )+10 log 10( M* 2 ⁇ )+ ⁇ PSSCH ( i ) ⁇ [dBm] Equation 4
  • Equation 4 each parameter may be interpreted to be the same as Equation 3 illustrated in FIG. 8 .
  • Equation 4 differs from Equation 3 in that the size of frequency blocks allocated for the PSCCH is different. That is, it is illustrated that in Equation 4, N1 frequency blocks are used, and in Equation 3, M frequency blocks are used.
  • a definition and a method of use of parameters including P 0_PSCCH , ⁇ PSCCH , ⁇ PSCCH and P 0_PSSCH , ⁇ PSSCH , ⁇ PSSCH which are used in Equation 4 may be equal to the definition and the embodiment described in Equation 3 of FIG. 8 .
  • the transmission power parameters used in Equation 4 may use a set value that the transmission UE receives from the base station or use a value preset to the UE by means of the methods mentioned in FIGS. 8 and 9 .
  • the UEs exiting out of the coverage of the base station may not receive, from the base station, setting with respect to transmission power parameters. Therefore, these UEs may use preset values with respect to the parameters.
  • the set values may include 0, 0 dB, or 0 dBm.
  • the preset value may indicate a value input in a UE in the factory or when the UE has existed within the coverage of the base station (the UE is positioned out of the coverage of the base station now), may indicate a value set by the base station.
  • exchange of parameters between UEs may not be performed (assuming that exchange of parameters between the UEs is performed in a PC5 RRC layer) when a UE pairing for performing unicast communication is not formed (for example, before PC5 RRC configuration is completed in a PC5 RRC layer of UE A and UE B), or before a UE grouping for performing groupcast communication is formed.
  • a transmission UE for the unicast and groupcast communications may not set a transmission power value based on a sidelink path loss signal.
  • the preset value with respect to the mentioned parameters may be used, or the value transmitted from the base station through RRC configuration and system information of the base station may be used.
  • the values of the parameters used at this time may be different from the values of the parameters used after PC5 RRC configuration.
  • PL(q) that the transmission UE uses before PC5 RRC configuration in Equation 7, Equation 8, Equation 9, Equation 10, and Equation 11 may indicate a path loss value with respect to Uu link between the base station and the transmission UE, not the sidelink path loss value.
  • each of the parameters may include the value of 0, 0 dB, or 0 dBm.
  • the V2X UE may use the preset transmission power value (for example, [X] dBm) or the transmission power value set by the base station.
  • the transmission power values preset for transmitting the PSCCH, the PSSCH, and the PSFCH (or the transmission power values set by the base station) may be different from each other.
  • the preset transmission power values or the transmission power values set by the base station, of the PSCCH, the PSSCH, and the PSFCH may be expressed as the transmission power value and the offset value with respect to one channel.
  • the transmission power value of the PSCCH may be set to be [X] dBm
  • the offset value for transmission power of the PSSCH and the PSFCH may be set to be +/ ⁇ [Y] dB (or dBm), based on the transmission power value of the PSCCH. It may be equally applied even when the transmission power values of the PSCCH, the PSSCH, and the PSFCH are set by the base station.
  • FIG. 10 illustrates a V2X frame structure according to an embodiment of the disclosure.
  • FIG. 10 unlike FIGS. 8 and 9 , illustrates that a PSCCH and a PSSCH are frequency-division-multiplexed on the frequency axis, and similar to FIG. 9 , illustrates that the PSCCH and the PSSCH are constituted by different numbers of resource blocks. That is, on the frequency axis, the PSCCH may be constituted by N1 frequency blocks and the PSSCH may be constituted by M frequency blocks, and on the time axis, the PSCCH and the PSSCH may be constituted by the same number of symbols. N1 may be equal to or different from M.
  • the V2X transmission UE may transmit sidelink control information (SCI) including time/frequency allocation information of the PSSCH through the PSCCH.
  • SCI sidelink control information
  • the V2X reception UE may receive and decode the PSCCH, and then may acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 10 illustrates the PSSCH constituted by (M ⁇ N2) frequency blocks, which is physically continuously positioned after the PSCCH constituted by the N1 frequency blocks, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • a PSFCH may exist in the later part of the K symbols.
  • the PSCCH and the PSSCH may be constituted by the K1 symbols and a guard symbol
  • the PSFCH may be constituted by the K2 symbols, and K1+ the number of guard symbols+K2 may be equal to or smaller than K.
  • the guard symbol may be one or at least two OFDM symbols.
  • the V2X reception UE may decode the PSSCH, and then transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X UE using a sidelink resource structure of FIG. 10 may determine each of transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH through Equation 5.
  • P PSSCH ( i ) ⁇ 1+min ⁇ Pc max( i ), P 0_PSCCH + ⁇ PSCCH *PL ( q )+ ⁇ + ⁇ PSSCH ( i ) ⁇ [dBm]
  • P PSSCH ( i ) ⁇ 2+min ⁇ Pc max( i ), P 0_PSSCH + ⁇ PSSCH *PL ( q )+ ⁇ + ⁇ PSSCH ( i ) ⁇ [dBm] Equation 5
  • Equation 5 each parameter indicates the following.
  • the transmission UE for unicast and groupcast communications may not set a sidelink transmission power value based on a sidelink path loss value.
  • a preset value may be used, or a value transmitted from the base station through RRC configuration and system information of the base station may be used.
  • the values of the parameters used at this time may be different from the values of the parameters used after PC5 RRC configuration.
  • PL(q) that the transmission UE uses before PC5 RRC configuration in Equation 7, Equation 8, Equation 9, Equation 10, and Equation 11 may indicate a path loss value with respect to Uu link between the base station and the transmission UE, not the sidelink path loss value.
  • each of the parameters may include the value of 0, 0 dB, or 0 dBm.
  • the preset transmission power values or the transmission power values set by the base station, of the PSCCH, the PSSCH, and the PSFCH may be expressed as the transmission power value and the offset value with respect to one channel.
  • the transmission power value of the PSCCH may be set to be [X] dBm
  • the offset value for transmission power of the PSSCH and the PSFCH may be set to be +/ ⁇ [Y] dB (or dBm), based on the transmission power value of the PSCCH. It may be equally applied even when the transmission power values of the PSCCH, the PSSCH, and the PSFCH are set by the base station.
  • FIG. 11 illustrates a V2X frame structure according to an embodiment of the disclosure.
  • FIG. 11 which is considered to be a combination of FIGS. 9 and 10 , it illustrates that a PSCCH and a PSSCH are frequency-division-multiplexed in K1 symbols, and in remaining K2 symbols, only the PSSCH is transmitted without PSCCH transmission.
  • the PSCCH may be constituted by N1 frequency blocks on the frequency axis, and may be constituted by K1 symbols on the time axis.
  • the PSSCH may be constituted by N2 frequency blocks during the length of the K1 symbols, and may be frequency-divided with the PSCCH.
  • the PSSCH are not frequency-divided with the PSCCH during the length of the K2 symbols, and may be constituted by M frequency blocks.
  • N1 and N2 may be equal to or different from M.
  • FIG. 11 illustrates that the PSCCH constituted by the N1 frequency blocks and the PSSCH constituted by (M ⁇ N2) frequency blocks are physically continuously positioned, but they may not be physically continuously positioned (that is, they may be logically continuously positioned without being physically continuously positioned).
  • the values of K1 and K2 may be equal to or different from each other, and when the values of K1 and K2 are different from each other, it may be K1>K2 or K1 ⁇ K2.
  • the V2X transmission UE may transmit sidelink control information including time/frequency allocation information of the PSSCH through the PSCCH.
  • the V2X reception UE may receive and decode the PSCCH, and then may acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 11 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • a PSFCH may exist within a sidelink resource constituted by K symbols.
  • the PSCCH may be constituted by the K1 symbols
  • the PSSCH may be constituted by the K1+K2 symbols and a guard symbol
  • the PSFCH may be constituted by K3 symbols, and K1+K2+ the number of guard symbols+K3 may be equal to or smaller than K.
  • the guard symbol may be one or at least two OFDM symbols.
  • the size of resource blocks may be equal to or different from the size of resource blocks of the PSCCH and the PSSCH.
  • the V2X reception UE may decode the PSSCH, and then transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X UE using a sidelink resource structure of FIG. 11 may determine transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH by using one of methods mentioned below.
  • P PSSCH-1 may indicate transmission power of the PSSCH during a section of K1 symbols when the PSCCH and the PSSCH are frequency-divided and transmitted.
  • P PSSCH-2 may indicate transmission power of the PSSCH during a section of K2 symbols when only the PSCCH is transmitted.
  • sidelink transmission time i when transmission power of symbols of the same channel is changed, a problem may occur.
  • the PSCCH and the PSSCH are simultaneously transmitted during the section of K1 symbols, and only the PSSCH is transmitted during the section of K2 symbols.
  • the PSCCH and the PSSCH may use different transmission power control parameters.
  • the transmission power for transmitting the K1 symbols may be different from the transmission power for transmitting the K2 symbols. In that case, due to the phase shift and discontinuity, a transmission signal may be transmitted while being distorted.
  • it is required to set the transmission power used for transmitting the K1 symbols and the transmission power used for transmitting the K2 symbols to have the same value, and it may be achieved through Equation 8 or Equation 9.
  • P Sidelink ( i ) min ⁇ Pc max( i ), P PSCCH ( i )+ P PSSCH-1 (1), P PSSCH-2 ( i ) ⁇ Equation 8
  • P Sidelink ( i ) min ⁇ Pcmax( i ),max[ P PSSCH ( i ) +P PSSCH-1 ( i ) ,P PSSCH-2 ( i )] ⁇ Equation 9
  • Equation 8 and Equation 9 each parameter may indicate the following.
  • P PSSCH-2 (i) may be scaled up or scaled down.
  • P PSSCH-2 (i) may be equal to P PSSCH-2 (i) illustrated in Equation 7.
  • the UE may use P PSSCH-2 (i) obtained by Equation 11 to calculate transmission powers of the PSCCH and PSSCH transmitted in the section of K1 symbols. More specifically, through P PSSCH-2 (i) obtained by Equation 11, and P PSSCH (i) and P PSSCH-1 (i) illustrated in Equation 7, temporary transmission powers of the PSCCH and the PSSCH in the section of K1 symbols may be calculated and values of X1, X2, and Y may be calculated as shown in Equation 12.
  • the UE may determine transmission powers of the PSCCH and the PSSCH transmitted in the section of K1 symbols through Equation 13, by using the values of X1, X2, and Y obtained by Equation 12.
  • P PSCCH ( i ) 10 log 10[ X 1* Y /( X 1+ X 2)]
  • P PSSCH-1 ( i ) 10 log 10[ X 2* Y /( X 1+ X 2)] Equation 13
  • Equation 3 Equation 4, Equation 5, and Equation 7
  • Another precondition of method 2 is that P PSCCH and P PSSCH may have the fixed power density offset or the set power density offset. Under these assumptions, method 2 may have two methods described below.
  • P PSCCH and P PSSCH-1 may be determined by Equation 14.
  • P PSCCH ( i ) ⁇ 1+ P 0 + ⁇ PL ( q )+ ⁇ + ⁇ ( i )[dBm]
  • P PSSCH-1 ( i ) ⁇ 2+ P 0 + ⁇ PL ( q )+ ⁇ + ⁇ ( i )[dBm] Equation 14
  • Equation 14 ⁇ 1 and ⁇ 2 may be equal to what defined in Equation 6.
  • 13 may indicate 10 log 10[(M ⁇ N1)+10 ⁇ circumflex over ( ) ⁇ ( ⁇ /10) ⁇ N1] [dB].
  • Transmission power at the i-th sidelink transmission time may be calculated as shown in Equation 10, by using Equation 14.
  • method 2-1 when sizes of frequency blocks in the K1 symbols and the K2 symbols are different, the value of P PSSCH (i)+P PSSCH-1 (i) may be different from P PSSCH-2 (i). In that case, as illustrated above, P PSSCH-2 (i) may be scaled up or scaled down.
  • sidelink transmission power may be determined by Equation 11.
  • P Sidelink (i) having been determined by Equation 11 may be distributed by Equation 12 and Equation 13.
  • the transmission UE may use the value set by the base station or use the value preset to the UE, by means of the methods mentioned in FIGS. 8 to 11 .
  • UEs existing out of the coverage of the base station may not receive setting with respect to transmission power parameters from the base station. Therefore, these UEs may use values preset with respect to the parameters.
  • the set values may include 0, 0 dB, or 0 dBm.
  • the preset value may indicate a value input in a UE at the factory or, when the UE has existed within the coverage of the base station (the UE is positioned out of the coverage of the base station now), may indicate a value set by the base station.
  • exchange of parameters between the UEs, which are to perform unicast/groupcast communication may not be performed when an unicast UE pair for performing unicast communication is not formed (for example, a case in which PC5 RRC configuration is not completed), or before a UE grouping for performing groupcast communication is formed.
  • the transmission UE for unicast and groupcast communications may not set a transmission power value.
  • a preset value may be used, or a value transmitted from the base station through RRC configuration and system information of the base station may be used.
  • the values of the parameters used at this time may be different from the values of the parameters used after PC5 RRC configuration.
  • PL(q) that the transmission UE uses before PC5 RRC configuration in Equation 7, Equation 8, Equation 9, Equation 10, and Equation 11 may indicate a path loss value with respect to Uu link between the base station and the transmission UE, not the sidelink path loss value.
  • each of the parameters may include the value of 0, 0 dB, or 0 dBm.
  • the preset transmission power values or the transmission power values set by the base station, of the PSCCH, the PSSCH, and the PSFCH may be expressed as the transmission power value and the offset value with respect to one channel.
  • the transmission power value of the PSCCH may be set to be [X] dBm
  • the offset value for transmission power of the PSSCH and the PSFCH may be set to be +/ ⁇ [Y] dB (or dBm), based on the transmission power value of the PSCCH. It may be equally applied even when the transmission power values of the PSCCH, the PSSCH, and the PSFCH are set by the base station.
  • FIG. 12 illustrates a V2X frame structure according to an embodiment of the disclosure.
  • FIG. 12 similar to FIGS. 8 and 9 , it illustrates that a PSCCH and a PSSCH are time-division-multiplexed, but unlike FIG. 8 , illustrates that the PSCCH and the PSSCH are constituted by different numbers of resource blocks on the frequency axis. That is, on the frequency axis, the PSCCH may be constituted by M frequency blocks, and the PSSCH may be constituted by N1 frequency blocks (M>N1). Meanwhile, similar to FIGS. 8 and 9 , on the time axis, the PSCCH may be constituted by K1 symbols, and the PSSCH may be constituted by K2 symbols. The values of K1 and K2 are equal to or different from each other.
  • the V2X transmission UE may transmit sidelink control information (SCI) including time/frequency allocation information of the PSSCH through the PSCCH.
  • SCI sidelink control information
  • the V2X reception UE may receive and decode the PSCCH, and then may acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 12 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • FIG. 12 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • FIG. 12 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PS
  • a PSFCH may exist within a sidelink resource constituted by K symbols.
  • the PSCCH may be constituted by the K1 symbols
  • the PSSCH may be constituted by the K2 symbols and a guard symbol
  • the PSFCH may be constituted by K3 symbols, and K1+K2+ the number of guard symbols+K3 may be equal to or smaller than K.
  • the guard symbol may be one or at least two OFDM symbols.
  • the size of resource blocks may be equal to or different from the size of resource blocks of the PSCCH and the PSSCH.
  • the V2X reception UE may decode the PSSCH, and then transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X UE using a sidelink resource structure of FIG. 10 may determine each of transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH through Equation 15.
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSCCH + ⁇ PSCCH *PL ( q )+10 log 10( M* 2 ⁇ )+ ⁇ PSSCH ( i ) ⁇ [dBm]
  • P PSSCH ( i ) min ⁇ Pc max( i ), P 0_PSSCH + ⁇ PSSCH *PL ( q )+10 log 10( N 1*2 ⁇ )+ ⁇ PSSCH ( i ) ⁇ [dBm] Equation 15
  • Equation 15 each parameter may be interpreted to be the same as Equation 4 illustrated in FIG. 9 .
  • the transmission UE may use the value set by the base station or use the value preset to the UE, by means of the methods mentioned in FIGS. 8 to 12 .
  • UEs existing out of the coverage of the base station may not receive transmission power parameters set by the base station. Therefore, these UEs may use values preset with respect to the parameters.
  • the set values may include 0, 0 dB, or 0 dBm.
  • the preset value may indicate a value input in a UE at the factory or, when the UE has existed within the coverage of the base station (the UE is positioned out of the coverage of the base station now), may indicate a value set by the base station.
  • exchange of parameters between UEs, which are to perform unicast/groupcast communication may not be performed when a UE pairing for performing unicast communication is not formed (for example, before PC5 RRC configuration is completed), or before a UE grouping for performing groupcast communication is formed.
  • a transmission UE for the unicast and groupcast communications may not set a sidelink transmission power value, based on sidelink path loss estimation.
  • the UE may use the preset value or the value transmitted from the base station through RRC configuration and system information of the base station. The values of the parameters used at this time may be different from the values of the parameters used after PC5 RRC configuration.
  • PL(q) that the transmission UE uses before PC5 RRC configuration in Equation 7, Equation 8, Equation 9, Equation 10, and Equation 11 may indicate a path loss value with respect to Uu link between the base station and the transmission UE, not the sidelink path loss value.
  • each of the parameters may include the value of 0, 0 dB, or 0 dBm.
  • the preset transmission power values or the transmission power values set by the base station, of the PSCCH, the PSSCH, and the PSFCH may be expressed as the transmission power value and the offset value with respect to one channel.
  • the transmission power value of the PSCCH may be set to be [X] dBm
  • the offset value for transmission power of the PSSCH and the PSFCH may be set to be +/ ⁇ [Y] dB (or dBm), based on the transmission power value of the PSCCH. It may equally applied even when the transmission power values of the PSCCH, the PSSCH, and the PSFCH are set by the base station.
  • FIG. 13 illustrates a multiplexing method of a sidelink channel within a sidelink resource according to an embodiment of the disclosure.
  • FIG. 13 illustrates that a PSCCH and a PSSCH are frequency-division-multiplexed in K1 symbols, and only the PSSCH is transmitted in K2 symbols, but unlike FIG. 11 , illustrates that a PSFCH constituted by K3 symbols exists.
  • the value of K3 may be 1 or an integer larger than 1 (for example, 2 or 3). That is, the K symbols may be constituted by K1 PSCCH/PSSCH symbols frequency-division-multiplexed, K2 PSSCH symbols, K3 PSFCH symbols, and guard symbols (GAP symbols).
  • the values of K1 and K2 may be equal to or different from each other.
  • the values of K1 and K2 when the values of K1 and K2 are different from each other, the values may be to be K1>K2 or K1 ⁇ K2.
  • the value may be K1+K2+ the number of guard symbols 1+K3+ the number of guard symbols 2 may be equal to or smaller than K, and the guard symbol 1 and the guard symbol 2 may one or at least two OFDM symbols.
  • the guard symbol 1 and the guard symbol 2 may be OFDM symbols having different lengths.
  • the guard symbol 1 may be constituted by two OFDM symbols
  • the guard symbol 2 may be constituted by one OFDM symbol.
  • M is illustrated as the size of resource blocks on the frequency axis of the PSFCH, but the size of resource blocks of the PSFCH may be equal to or different from the size of resource blocks of the PSCCH and the PSSCH.
  • the V2X reception UE may decode the PSSCH, and then transmit the PSFCH including the result (that is, ACK/NACK information) to the V2X transmission UE.
  • the V2X transmission UE may transmit sidelink control information (SCI) through the PSCCH constituted by K1 symbols on the time axis and N2 frequency blocks on the frequency axis.
  • the sidelink control information may include time/frequency allocation information of the PSSCH constituted by K1+K2 symbols on the time axis and M frequency blocks on the frequency axis and be then transmitted.
  • the V2X reception UE may receive, from the transmission UE, and decode the PSCCH, and may then acquire the time/frequency allocation information of the PSSCH and decode the PSSCH.
  • FIG. 13 illustrates the PSSCH constituted by the K2 symbols, which is physically continuously positioned after the PSCCH constituted by the K1 symbols, although they may not be physically continuously positioned (that is, the PSSCH may be logically continuously positioned without being physically continuously positioned after the PSCCH).
  • the PSCCH may be constituted by N1 frequency blocks on the frequency axis.
  • the V2X transmission UE using a sidelink resource structure of FIG. 13 may determine transmission power (P PSSCH ) of the PSCCH and transmission power (P PSSCH ) of the PSSCH through Equation 16, Equation 17 or Equation 18.
  • P PSCCH ( i ) X 1+min ⁇ Pc max( i ),10 log 10( X 2*2 ⁇ )+ P 0_PSCCH + ⁇ PSCCH *PL ( q ) ⁇ [dBm] Equation 16
  • P PSSCH ( i ) X 1+min ⁇ Pc max( i ),10 log 10( X 2*2 ⁇ +P 0_PSCCH + ⁇ PSCCH *PL ( q ), P congestion ⁇ [dBm] Equation 17
  • P PSSCH ( i ) X 1+min ⁇ Pc max( i ),10 log 10( X 2*2 ⁇ )+ P 0_PSCCH + ⁇ PSCCH *PL ( q ), P congestion ,P Range ⁇ [dBm] Equation 18
  • Equation 16 Equation 17, and Equation 18 may indicate the following.
  • M PSCCH and M PSSCH may indicate the sizes of frequency blocks allocated for transmitting the PSCCH and the PSSCH, respectively.
  • ⁇ is a parameter for power boosting of the PSCCH. For example, when the PSCCH performs power boosting in order to maintain a PSD higher 3 dB than that of the PSSCH, ⁇ may be 3.
  • ⁇ When the PSCCH and the PSSCH maintain the same PSD (or a case in which power boosting is not performed), ⁇ may be 0.
  • the fixed value may be used as the value of ⁇ (that is, ⁇ is fixed to 3), or the value of ⁇ may be set through RRC and system information of the base station.
  • the value of ⁇ When there is no base station, the value of ⁇ may be preset. For example, in a case in which the value of ⁇ is set, the V2X transmission UE and reception UE may receive the value of ⁇ which is set through PC-5 RRC, when unicast connection is configured.
  • PSD power spectral density
  • PL may indicate an estimated path loss value.
  • the path loss value may be estimated by Equation 2.
  • P Congestion included in Equation 17 and Equation 18 is a parameter reflecting a congestion level of the V2X transmission UE, and may indicate the maximum transmission power that the V2X transmission UE may use according to the congestion level. More specifically, when the base station determines that the congestion level is high in a resource pool configured thereby, the base station may transmit a value of P Congestion to the V2X transmission UE through system information and RRC configuration. In another example, the V2X transmission UE may receive a set value of P Congestion when unicast link connection is configured through PC-5 RRC. In another example, the V2X transmission UE may use a value of P Congestion included in preconfigured resource pool information.
  • the value of P Congestion has a unit of [dBm] and may have a range from ⁇ 41 [dBm] to 31 [dBm] by 1 [dBm].
  • the value of P Congestion may be associated with the priority of the PSSCH that the V2X transmission UE transmits. That is, when the priority of the PSSCH that the V2X transmission UE transmits is high, even though the congestion level is high, the set value of P Congestion may be high (for example, 31 [dBm]) because the transmission of the PSCCH and the PSSCH corresponding thereto should be successfully performed.
  • the set value of P Congestion may be low (for example, ⁇ 41 [dBm]).
  • the resource pool information of the PSCCH may be configured from the base station or PC-5 RRC, or may be preconfigured.
  • a V2X resource allocation mode in which the V2X transmission UE selects a resource for transmitting the PSCCH through a sensing process, may exist.
  • the sensing process may indicate a process of decoding sidelink control information (SCI) transmitted through the PSCCH and a process of measuring RSRP of the DMRS of the PSSCH associated with the PSCCH.
  • SCI sidelink control information
  • a mode in which the V2X transmission UE selects a resource through the sensing process may be called mode-2.
  • V2X transmission UEs operating in mode-2 may perform decoding of the PSCCH to select the PSCCH resource which may be occupied thereby within the configured (or preconfigured) PSCCH resource pool or the PSCCH resource region. In addition, the V2X transmission UE may measure the congestion level of the PSCCH transmitted from each slot within the PSCCH resource pool or the PSCCH resource region. Similarly, V2X transmission UEs operating in mode-2 may perform decoding of the PSCCH to select the PSSCH resource which may be occupied thereby within the configured (or preconfigured) PSSCH resource pool or the PSSCH resource region, and may measure RSRP of the DMRS transmitted through the PSSCH. In addition, the V2X transmission UE may measure the congestion level of the PSSCH transmitted from each slot within the PSSCH resource pool or the PSSCH resource region.
  • the congestion level of the PSCCH or the PSSCH may be measured by means of a ratio (B/A) between the entire number of resources constituting the PSCCH resource pool (or PSCCH resource region) or the PSSCH resource pool (or PSSCH resource region) and the number of resources occupied by other UE. That is, when the congestion level of the PSCCH is measured, A may be the entire number of PSCCH resources constituting the PSCCH resource pool, and when the congestion level of the PSSCH is measured, A may be the entire number of PSSCH resources constituting the PSSCH resource pool.
  • B may be calculated by comparing the value of a received signal strength indicator (RSSI) of the PSCCH symbols with the critical value of the RSSI, which is set(or is preset) through the base station or PC-5 RRC.
  • RSSI received signal strength indicator
  • the PSCCH that each UE transmits within the PSCCH resource pool is constituted by x symbols
  • the total received power (x total received powers) for each of the symbols is obtained to obtain the average of x symbols. Accordingly, the RSSI of the PSCCH that each UE transmits may be measured.
  • the V2X transmission UE may compare the measured value of the RSSI with the critical value of the RSSI, which is set (or preset) through the base station or PC-5 RRC, and may thus determine that the corresponding PSCCH is occupied by other UE when the measured value of the RSSI is larger than the set critical value of the RSSI. Therefore, the corresponding PSCCH may be included in B. Meanwhile, when the congestion level of the PSSCH is measured, B may be calculated by comparing the value of the RSSI of the PSSCH symbols with the critical value of the RSSI, which is set (or preset) through the base station or PC-5 RRC.
  • the measurement of the congestion level may be calculated during the specific time section. For example, A and B may be measured with respect to the PSCCH resource (or PSSCH resource) existing within the time section to [n-K, n-1] slot of the configured PSCCH resource pool (or PSSCH resource pool). Therefore, the congestion level measured in n slot may indicate the congestion level measured with respect to the PSCCH resource (or PSSCH resource) existing within the time section to [n-K, n ⁇ 1] slot.
  • the fixed value (or preset value) may be used as K, or K may be set through the base station or PC-5 RRC.
  • the congestion measurement time to obtain the congestion level is required to be defined.
  • the base station or PC-5 RRC may use a measured congestion level result before k1 slot or k2 symbol prior to the i-th PSCCH transmission of the UE transmission UE. That is, the congestion level reflected in the value of P Congestion used for the transmission power calculation of the PSCCH transmitted through the i-th slot may indicate the congestion level measured at i-k1 slot or the congestion level measured before k2 symbol, based on the first symbol of the PSCCH transmitted through the i-th slot.
  • the congestion level measured at i-k1 slot may indicate the congestion level measured with respect to the PSCCH resource existing within the [i-k1-K, i-k1-1] time section.
  • the congestion level measured in i-k2 symbol may indicate the congestion level measured with respect to the PSCCH resource existing within the [i-k2-K, i-k2-1] time section.
  • Equation 16 may be applied in a mode (mode-1) in which the base station schedules a transmission resource of the V2X transmission UE by using downlink control information (DCI) transmitted through a PDCCH.
  • mode-1 mode 1
  • DCI downlink control information
  • Equation 16 may be applied, or when both the values of P Range and P Congestion of Equation 18 are not set from the base station or PC-5 RRC, Equation 16 may be applied.
  • Equation 17 When the value of P Congestion is set from the base station or PC-5 RRC, Equation 17 may be applied. When both the values of P Range and P Congestion are set from the base station or PC-5 RRC, Equation 18 may be applied. The value of P Congestion may be omitted from Equation 18. In that case, when the value of P Range is set from the base station or PC-5 RRC, Equation 18 may be applied.
  • the V2X UE may be configured with respect to whether to perform sidelink transmission power by using downlink path loss with the base station or whether to perform sidelink transmission power by using sidelink path loss between V2X UEs.
  • the information may be configured through the configuration of a path loss estimation signal that the V2X transmission UE or the V2X reception UE may use. More specifically, as mentioned in FIG.
  • the V2X transmission UE and the V2X reception UE may be configured by the base station such that path loss is estimated by using a downlink synchronization signal block (SSB) or a CSI-RS (that is, a SSB or a CSI-RS is configured as a path loss estimation signal).
  • SSB downlink synchronization signal block
  • CSI-RS that is, a SSB or a CSI-RS is configured as a path loss estimation signal.
  • the V2X transmission UE and the V2X reception UE may be configured by the base station such that path loss is estimated by using a sidelink reference signal (for example, a sidelink CSI-RS transmitted through the PSSCH or a DMRS transmitted through the PSSCH) (that is, a sidelink CSI-RS or a DMRS is configured as a path loss estimation signal).
  • a sidelink reference signal for example, a sidelink CSI-RS transmitted through the PSSCH or a DMRS transmitted through the PSSCH
  • a sidelink CSI-RS or a DMRS is configured as a path loss estimation signal.
  • the sidelink resource pool information may include information on whether to apply the mentioned downlink path loss value to sidelink transmission power, whether to apply an uplink path loss value to sidelink transmission power, or whether to use any path loss estimation signal which may have the same meaning as it.
  • the base station may transmit, to the UE, information on the sidelink resource pool through system information or RRC configuration, and the information on the sidelink resource pool may include set parameters for sidelink transmission power, which may be used in the corresponding resource pool.
  • the parameters for transmission power may include at least one piece of information on P 0_PSCCH , ⁇ PSCCH , and PL(q) mentioned in Equation 16, Equation 17, and Equation 18.
  • the SSB, CSI-RS, sidelink CSI-RS, or sidelink DMRS is used for the resource pool information through system information or RRC configuration.
  • the V2X transmission UE may receive set parameters for sidelink transmission power from the preconfigured resource pool information. In that case, the V2X UE may acquire the transmission power parameters mentioned above from the preconfigured resource pool information.
  • the V2X transmission UE may perform PC-5 RRC configuration.
  • parameters for sidelink transmission power are set from the PC-5 RRC (a case in which the sidelink resource pool information does not include the sidelink transmission power parameters), or as information on the sidelink resource pool is configured from the PC-5 RRC, the parameters for sidelink transmission power may be set (a case in which the sidelink resource pool information includes the sidelink transmission power parameters).
  • P 0_PSCCH and ⁇ PSCCH when downlink path loss is applied or when sidelink path loss is applied, P 0_PSCCH and ⁇ PSCCH may be set to have different values. That is, when the UE applies downlink path loss, P 0_PSCCH and ⁇ PSCCH may be set to be A1 and B1, respectively, and when the UE applies sidelink path loss, P 0_PSCCH and ⁇ PSCCH may be set to be A2 and B2, respectively.
  • sidelink transmission power control may be performed with the purpose of reducing interference caused by the sidelink transmission in an uplink signal received by the base station, thus a downlink path loss value may be applied.
  • a sidelink path loss value may be applied in order to reduce power consumption.
  • the V2X UE may receive all sidelink transmission power parameters when the downlink path loss value is applied and sidelink transmission power parameters when the sidelink path loss value is applied. That is, the V2X UE may receive, from the base station, through system information or RRC, or through PC-5 RRC of the UE, all of: P 0_PSSCH and ⁇ PSCCH which may be used when the downlink path loss value is applied, and the type of path loss estimation signals for estimating downlink path loss (a SSB or a downlink CSI-RS); and P 0_PSCCH and ⁇ PSCCH which may be used when the sidelink path loss value is applied, and the type of sidelink path loss estimation signals for estimating sidelink path loss (a sidelink CSI-RS or a sidelink DMRS).
  • P 0_PSSCH and ⁇ PSCCH which may be used when the downlink path loss value is applied
  • the type of path loss estimation signals for estimating downlink path loss a SSB or a downlink CSI-RS
  • the resource pool information may include sidelink transmission power parameter information including P 0_PSCCH and ⁇ PSCCH , and the type of path loss estimation signals for estimating path loss. More specifically, all of: P 0_PSCCH_DL and ⁇ PSCCH_DL which may be used when the downlink path loss value is applied, and the type of path loss estimation signals used for estimating downlink path loss; and P 0_PSSCH SL and ⁇ PSSCH_SL which may be used when the sidelink path loss value is applied, and the type of sidelink path loss estimation signals used for estimating sidelink path loss may be configured in the resource pool information (that is, both a SSB or a downlink CSI-RS and a sidelink CSI-RS or a sidelink DMRS are configured).
  • the V2X UE may calculate the PSCCH transmission power through Equation 19 or Equation 20.
  • P PSCCH ( i ) X 1+min ⁇ Pc max( i ),10 log 10( X 2*2 ⁇ )+min ⁇ P 1, P 2 ⁇ [dBm] Equation 19
  • P PSCCH ( i ) X 1+min ⁇ Pc max( i ),min ⁇ P 3, P 4 ⁇ [dBm] Equation 20
  • Equation 19 and Equation 20 may indicate the following.
  • Equation 19 may be expressed as Equation 21.
  • P PSCCH ( i ) X 1+min ⁇ Pc max( i )
  • P Congestion ,P Range 10 log 10( X 2*2 ⁇ )+min ⁇ P 1, P 2 ⁇ [dBm] Equation 21
  • Equation 21 illustrates a case in which both P Congestion and P Range are included, but one of P Congestion and P Range may be omitted from Equation 21.
  • Equation 20 may be expressed as Equation 22.
  • P PSCCH ( i ) X 1+min ⁇ Pc max( i ), P Congestion ,P Range ,min ⁇ P 3, P 4 ⁇ [dBm] Equation 22
  • Equation 22 illustrates a case in which both P Congestion and P Range are included, but, as shown in Equation 21, one of P Congestion and P Range may be omitted from Equation 22.
  • Equation 16 Equation 17, Equation 18, Equation 19, Equation 20, Equation 21, and Equation 22 are equations for determining the transmission power value of the PSCCH.
  • the transmission power value of the PSSCH may be calculated, but the transmission power of the PSSCH may be calculated while being divided into two parts.
  • the first part is transmission power of the PSSCH, which corresponds to K1 symbols in FIG. 13 , and may indicate PSSCH transmission power in symbols during which the PSCCH and the PSSCH are frequency-division-multiplexed. It may be defined as P PSSCH-1 (i).
  • the second part is transmission power of the PSSCH, which corresponds to K2 symbols in FIG. 13 , and may indicate PSSCH transmission power in symbols during which the PSCCH is not frequency-division-multiplexed.
  • P PSSCH-2 (i) may be defined by changing X1 defined in each of Equation 16, Equation 17, Equation 18, Equation 19, Equation 20, Equation 21, and Equation 22 to X1-c.
  • P PSSCH-1 (i) may be calculated as shown in Equation 23.
  • P PSSCH-1 ( i ) X 1 ⁇ +min ⁇ Pc max( i ), P Congestion ,P Range ,10 log 10( X 2*2 ⁇ )+min ⁇ P 1, P 2 ⁇ [dBm] Equation 23
  • Equation 23 Parameters defined in Equation 23 may be the same as what described in Equation 21.
  • Equation 16 Equation 17, Equation 18, Equation 19, Equation 20, or Equation 22 is used to calculate the PSCCH transmission power value
  • X1 defined in each of the equations is changed to X1-c, and an equation for calculating P PSSCH-1 (i) may be thus derived.
  • the transmission power equation with respect to the first part of the PSCCH and the PSSCH constituting K1 symbols in FIG. 13 has been described. Based on it, the equation for calculating the transmission power value (P PSSCH-2 (i)) with respect to the second part of the PSSCH may be defined by considering the following.
  • each symbol constituting the K1+K2 symbols should have the same transmission power.
  • the transmission power of each of the symbols is not the same, since a guard section (or GAP) for power transient is required between symbols whose transmission power is changed, inefficient use of resources may occur.
  • the transmission power level between symbols is changed, the reception performance of the corresponding symbols at the reception side may be degraded due to the change in phase between the symbols.
  • the transmission power of the K1 symbols during which the PSCCH and the PSSCH are frequency-division-multiplexed and the transmission power of the K2 symbols during which only the PSSCH is transmitted should be equally maintained.
  • the transmission power value (P PSSCH-2 (i)) with respect to the second part of the PSSCH may be determined through Equation 24.
  • P PSCCH-2 ( i ) P PSSCH ( i )+ P PSSCH-1 ( i )[dBm] Equation 24
  • Equation 24 The parameters of Equation 24 are the same as what mentioned in Equation 16, Equation 17, Equation 18, Equation 19, Equation 20, Equation 21, Equation 22, and Equation 23.
  • each of P PSSCH (i) and P PSSCH-1 (i) may be smaller than the value of Pcmax(i) which is the UE maximum transmission power (that is, P PSSCH (i) ⁇ Pcmax(i) and P PSSCH-1 (i) ⁇ Pcmax(i)), but P PSSCH-2 (i) which is the sum of P PSSCH (i) and P PSSCH-1 (i) may be larger than Pcmax(i).
  • P PSSCH-2 (i) may be recalculated through Equation 25 and Equation 26.
  • Equation 26 ⁇ is a scaling factor and may be larger than 0, and smaller than or equal to 1. In order to satisfy P PSSCH-2 (i) ⁇ Pcmax(i), the value of ⁇ may be set by the transmission UE.
  • ⁇ is a scaling factor and may be larger than 0, and smaller than or equal to 1.
  • the transmission power of P PSSCH-2 (i) is redistributed at a rate between the transmission powers of P PSSCH (i) and P PSSCH-1 (i) and may update each of the transmission power values of P PSSCH (i) and P PSSCH-1 (i).
  • ⁇ [P PSSCH (i)+P PSSCH-1 (i)] is used to scale down the sum of the transmission power of P PSSCH (i)+P PSSCH-1 (i), or the changed transmission power value of P PSSCH-2 (i) is redistributed at a ratio between the transmission powers of P PSSCH (i) and P PSSCH-1 (i), and each of the transmission power values of P PSSCH (i) and P PSSCH-1 (i) may thus be updated.
  • the transmission power parameters used in Equation 16, Equation 17, Equation 18, Equation 19, Equation 20, Equation 21, Equation 22, Equation 23, Equation 24, and Equation 26 may use the value set to the transmission UE by the base station or may use the value preset in the UE by means of the methods mentioned in FIGS. 8 to 12 .
  • UEs existing out of the coverage of the base station may not receive set transmission power parameters from the base station. Therefore, these UEs may use preset values with respect to the parameters.
  • the set values may include 0, 0 dB, or 0 dBm.
  • the preset value may indicate a value input in the UE in the factory, or when the UE has existed within the coverage of the base station (the UE is positioned out of the coverage of the base station now), may indicate a value set by the base station.
  • exchange of parameters between UEs, which are to perform unicast/groupcast communication may not be performed when a UE pairing for performing unicast communication is not formed (for example, before PC5 RRC configuration is completed), or before a UE grouping for performing groupcast communication is formed.
  • a transmission UE for the unicast and groupcast communications may not set a sidelink transmission power value, based on sidelink path loss estimation.
  • the UE may use the preset value or the value transmitted from the base station through RRC configuration and system information of the base station. The values of the parameters used at this time may be different from the values of the parameters used after PC5 RRC configuration.
  • PL(q) that the transmission UE uses before PC5 RRC configuration may indicate a path loss value with respect to Uu link between the base station and the transmission UE, not the sidelink path loss value.
  • each of the parameters may include the value of 0, 0 dB, or 0 dBm.
  • the preset transmission power values or the transmission power values set by the base station, of the PSCCH, the PSSCH, and the PSFCH may be expressed as the transmission power value and the offset value with respect to one channel.
  • the transmission power value of the PSCCH may be set to be [X] dBm
  • the offset value for transmission power of the PSSCH and the PSFCH may be set to be +/ ⁇ [Y] dB (or dBm), based on the transmission power value of the PSCCH. It may equally applied even when the transmission power values of the PSCCH, the PSSCH, and the PSFCH are set by the base station.
  • FIG. 14 illustrates an operational flowchart of a V2X UE for sidelink transmission power control according to an embodiment of the disclosure.
  • the V2X transmission UE may determine whether the V2X transmission UE exists within the coverage of the base station ( FIG. 1A ) or whether the V2X transmission UE exists out of the coverage of the base station ( FIG. 1C ).
  • the UE may obtain information on a sidelink resource pool at operation 1401 .
  • the UE may obtain information on a sidelink resource pool through RRC configuration or system information transmitted by the base station.
  • the UE may obtain information on a sidelink resource pool through system information preconfigured in the UE.
  • the UE may obtain information on sidelink transmission power parameters included in sidelink resource pool information at operation 1402 .
  • the sidelink transmission power parameters included in the sidelink resource pool information may include at least one of the following parameters.
  • the V2X transmission UE uses information on the parameters to set transmission powers of the sidelink control channel and the sidelink data channel at operation 1403 .
  • the V2X transmission UE uses the set transmission power value to transmit the sidelink control channel and the sidelink data channel at operation 1404 .
  • FIG. 15 is a diagram illustrating a UE configuration according to an embodiment of the disclosure.
  • the UE may include a transceiver 1520 and a controller 1510 configured to control the entire operation of the UE.
  • the transceiver 1520 may include a transmitter 1521 and a receiver 1523 .
  • the transceiver 1520 may transmit/receive a signal to/from other network entities.
  • the controller 1510 may control the UE to perform one action of the embodiments mentioned above.
  • the controller 1510 and the transceiver 1520 are not necessarily implemented as separate modules, and may be implemented as a single element in the form of a single chip.
  • the controller 1510 and the transceiver 1520 may be electrically connected to each other.
  • the controller 1510 may be a circuit, an application-specific circuit, or at least one processor.
  • operations of the UE may be realized by providing a memory device storing corresponding program codes to any element in the UE.
  • FIG. 16 is a diagram illustrating a base station's configuration according to an embodiment of the disclosure.
  • the base station may include a transceiver 1620 and a controller 1610 configured to control the entire operation of the base station.
  • the transceiver 1620 may include a transmitter 1621 and a receiver 1623 .
  • the transceiver 1620 may transmit/receive a signal to/from other network entities.
  • the controller 1610 may control the base station to perform one action of the embodiments mentioned above. Meanwhile, the controller 1610 and the transceiver 1620 are not necessarily implemented as separate modules, and may be implemented as a single element in the form of a single chip. In addition, the controller 1610 and the transceiver 1620 may be electrically connected to each other. For example, the controller 1610 may be a circuit, an application-specific circuit, or at least one processor. In addition, operations of the base station may be realized by providing a memory device storing corresponding program codes to any element in the base station.
  • FIGS. 1A to 1D, 2A and 2B, 3 to 16 are not intended to limit the scope of the disclosure. That is, all of the elements, entities, or operations described in FIGS. 1A to 1D, 2A and 2B, 3 to 16 should not be interpreted as essential elements for the implementation of the disclosure, and only some of the elements can be used to implement the disclosure within the scope which does not impair the nature of the disclosure.
  • the above described operations of the base station or UE may be implemented by providing a memory device storing corresponding program codes to any element in the base station or UE. That is, the controller of the base station or UE may perform the above described operations by reading and executing the program code stored in the memory device by means of a processor or a central processing unit (CPU).
  • Methods according to embodiments of the disclosure as defined by the appended claims or disclosed herein may be implemented in hardware, software, or a combination of hardware and software.
  • a computer-readable storage medium for storing one or more programs (software modules) may be provided.
  • the one or more programs stored in the computer-readable storage medium may be configured for execution by one or more processors within the electronic device.
  • the at least one program may include instructions that cause the electronic device to perform the methods according to various embodiments of the disclosure as defined by the appended claims or disclosed herein.
  • the programs may be stored in non-volatile memories including a random access memory and a flash memory, a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a magnetic disc storage device, a compact disc-ROM (CD-ROM), digital versatile discs (DVDs), or other type optical storage devices, or a magnetic cassette.
  • ROM read only memory
  • EEPROM electrically erasable programmable read only memory
  • CD-ROM compact disc-ROM
  • DVDs digital versatile discs
  • any combination of some or all of them may form a memory in which the program is stored.
  • a plurality of such memories may be included in the electronic device.
  • the programs may be stored in an attachable storage device which may access the electronic device through communication networks such as the Internet, Intranet, local area network (LAN), wide LAN (WLAN), and storage area network (SAN) or a combination thereof.
  • a storage device may access an electronic device which performs embodiments of the disclosure, via an external port.
  • a separate storage device on the communication network may access an electronic device which performs embodiments of the disclosure.
  • an element included in the disclosure is expressed in the singular or the plural according to a presented detailed embodiment.
  • the singular or plural expressions are selected to be suitable for proposed situations for convenience of description, and the disclosure is not limited to the singular or plural elements.
  • An element expressed in a plural form may be configured in singular, or an element expressed in a singular form may be configured in plural.

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US20200260386A1 (en) 2020-08-13
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